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rcutorture: Add task's CPU for rcutorture writer stalls

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It appears that at least some of the rcutorture writer stall messages
coincide with unusually long CPU-online operations, for example, no
fewer than 205 seconds in a recent test.  It is of course possible that
the writer stall is not unrelated to this unusually long CPU-hotplug
operation, and so this commit adds the rcutorture writer task's CPU to
the stall message to gain more information about this possible connection.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2017-06-19 10:03:22 -07:00
parent c234ee4b82
commit 808de39cf4
1 changed files with 3 additions and 2 deletions
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5
kernel/rcu/rcutorture.c
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@ -1319,11 +1319,12 @@ rcu_torture_stats_print(void)
srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp, srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp,
&flags, &gpnum, &completed); &flags, &gpnum, &completed);
wtp = READ_ONCE(writer_task); wtp = READ_ONCE(writer_task);
pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x ->state %#lx\n", pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x ->state %#lx cpu %d\n",
rcu_torture_writer_state_getname(), rcu_torture_writer_state_getname(),
rcu_torture_writer_state, rcu_torture_writer_state,
gpnum, completed, flags, gpnum, completed, flags,
wtp == NULL ? ~0UL : wtp->state); wtp == NULL ? ~0UL : wtp->state,
wtp == NULL ? -1 : (int)task_cpu(wtp));
show_rcu_gp_kthreads(); show_rcu_gp_kthreads();
rcu_ftrace_dump(DUMP_ALL); rcu_ftrace_dump(DUMP_ALL);
} }